STRUCT CPUFREQ_COOLING_DEVICE(9)

📦 version 7.3.1, in nixpkgs unstable

💅 STRUCT CPUFREQ_COOLING_DEVICE(9) ✨

okay bestie, sit down, we're reading a manpage from the Kernel API Manual and honestly? it's kind of iconic. this is the struct that holds everything you need to know about a registered cpufreq_cooling_device 🧊 — yes, cooling, as in thermal, as in "please don't melt, little CPU." she's a keeper of state and she takes that job very seriously 💜

🌸 NAME

struct cpufreq_cooling_device — literally the data for a cooling device that works with cpufreq 🎀

🦋 SYNOPSIS

struct cpufreq_cooling_device {
    u32 last_load;
    unsigned int cpufreq_state;
    unsigned int max_level;
    struct em_perf_domain *em;
    struct cpufreq_policy *policy;
    struct thermal_cooling_device_ops cooling_ops;
  #ifndef CONFIG_SMP;
    struct time_in_idle *idle_time;
  #endif;
    struct freq_qos_request qos_req;
 };

no cap, that's the whole shape of her 👑 (and yes, the #ifndef CONFIG_SMP and #endif are part of the vibe — copy them exactly, bestie, they're load-bearing 🙈)

🎀 Members

  • last_load — the load that was measured by the most recent call to cpufreq_get_requested_power ⚡ like, the freshest tea we have.
  • cpufreq_state — an integer value that represents the current state of cpufreq cooling devices 🎚️ she knows where she is in life.
  • max_level — the maximum cooling level ✨ and psst: it's one less than the total number of valid cpufreq frequencies (yes, one less, don't @ me).
  • em — a reference on the Energy Model of the device 🔋 main character energy model, honestly.
  • policy — the cpufreq policy 🫶.
  • cooling_ops — the cpufreq callbacks that get handed to the thermal cooling device ops 📞 she has connections.
  • idle_time — the idle time stats 😴 the sleep tracker of the struct world.
  • qos_req — the PM QoS constraint to apply 🎯 boundaries, but make them performance-y.

✨ Description

okay so this structure is required for keeping information of each registered cpufreq_cooling_device 💖 that's it, that's the job — she's the memory-holder, the record-keeper, the "who are you and what are your thermal opinions" of the cpufreq cooling world. lowkey essential. highkey slaying. periodt 🌈

💖 SEE ALSO

Kernel file ./drivers/thermal/cpufreq_cooling.c, plus all these besties who are also in the group chat:

ngl the whole thing lives in ./drivers/thermal and this edition is dated October 2026 — so like, future-coded of her 🦋

and that's the page bestie, ily, go forth and keep those CPUs cool 💅💜🍓

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